Thread: Need help on Switch statement!

I am attempting to write a program that asks the user to enter an integer and writes each digit in English.
For example: 234 would be two three four or 12 would be one two

This is what I have so far.

Code:

#include <stdio.h>

int main (void)
{ 
   int x;

   printf ("\tPlease enter an integer:");
   scanf ("%d", &x);
   printf ("\tYou have entered:\n");

   switch (x) {
    case 1:
    printf ("one");
    break;
    case 2:
    printf ("two");
    break;
    case 3:
    printf ("three");
    break;
    case 4:
    printf ("four");
    break;
    case 5:
    printf ("five");
    break;
    case 6:
    printf ("six");
    break;
    case 7:
    printf ("seven");
    break;
    case 8:
    printf ("eight");
    break;
    case 9:
    printf ("nine");
    break;
  }
    printf ("\n");
}

Did you have a specific question?

Or at least an idea of how you might approach this problem?

You can peel off digits from the right side using / and %, but will require a bit more work to take digits from the left side.

Elkvis' suggestion of using a string would probably be easiest.

Hi Tanieka, I am new to the forum and learning C from scrap.
Hope the below code does what you want.. I have done it using a string as above people suggests...i have limited the number of digits to ten, if you want you can increase or decrease them.
Please let me know.. if it does good to you..or need some more help.

Code:

//Program written by RajeshSS on 11:40PM 5-NOV-2014

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void printinwords(char c);
int main()
{
int i,j;
 char x[10];
 printf("Please enter a number: \n");
 gets(x);
 printf("number is %s \n",x);
 printf("number in words is \n");
 j=strlen(x);
for(i=0;i<j;i++)
{
    printinwords(x[i]);
    printf(" ");
}


}
printinwords(char c)
{
    switch(c)
    {
    case '0':
        printf("zero");
        break;
    case '1':
        printf("one");
        break;
    case '2':
        printf("two");
        break;
    case '3':
        printf("three");
        break;
    case '4':
        printf("four");
        break;
    case '5':
        printf("five");
        break;
    case '6':
        printf("six");
        break;
    case '7':
        printf("seven");
        break;
    case '8':
        printf("eight");
        break;
    case '9':
        printf("nine");
        break;
    }




}

@rajeshss: Welcome to the forum. While it's good you want to help, you should avoid handing out complete solutions as this robs the OP of a learning experience. We try to give out hints that lead people in the right direction, so they can arrive at the answers themselves.

Also, be sure to check your compiler warnings:

Code:

main.c|25|warning: return type defaults to 'int'|
main.c|24|warning: conflicting types for 'printinwords'|
main.c|6|note: previous declaration of 'printinwords' was here|

You forgot the return type in your function definition.

Code:

gets(x);

Don't use "gets()":
FAQ > Why gets() is bad / Buffer Overflows - Cprogramming.com
FAQ > Get a line of text from the user/keyboard (C) - Cprogramming.com

Welcome aboard!

Thanks guys for the help. I have a few questions though. What does the #include <sting.h> mean? and Is the for loop helping with entering more than one digit?

What does the #include <sting.h> mean?

It's "string" (not "sting"), and it's a standard header file that defines string-related functions:

<cstring> (string.h) - C++ Reference

and Is the for loop helping with entering more than one digit?

If you're referring to the code posted by rajeshss, then no - it has nothing to do with entering any input. Try reading the code slowly and carefully, and you should be able to see what is actually happening.

Originally Posted by Matticus

@rajeshss: Welcome to the forum. While it's good you want to help, you should avoid handing out complete solutions as this robs the OP of a learning experience. We try to give out hints that lead people in the right direction, so they can arrive at the answers themselves.

Also, be sure to check your compiler warnings:

Code:

main.c|25|warning: return type defaults to 'int'|
main.c|24|warning: conflicting types for 'printinwords'|
main.c|6|note: previous declaration of 'printinwords' was here|

You forgot the return type in your function definition.

Code:

gets(x);

Don't use "gets()":
FAQ > Why gets() is bad / Buffer Overflows - Cprogramming.com
FAQ > Get a line of text from the user/keyboard (C) - Cprogramming.com

Welcome aboard!

Hi, Matticus. Thank you for your warm welcome. First of all sorry about revealing the entire code. I was very enthusiast to post the code once it got the required result. I will try to follow the forum rules and guidelines from senior members henceforth. And Thank you for your comments on gets() etc... I will read to it.
Thank you very much!

Originally Posted by Elkvis

you don't need string.h or strlen().

try something like this:

Code:

int i = 0;
while (char c = x[i++])
{
    printinwords(c);
    printf(" ");
}

Hi Elkvis, really wondering that there exist more ways to get common function result instead of adding header files, Thank you for helping me to think on using minimal header file addition. I have a question does that really bring better efficiency or any better performance for the program..if i decrease the header file addtions and use own functions for smaller tasks as you did?

Originally Posted by Elkvis

you don't need string.h or strlen().

try something like this:

Code:

int i = 0;
while (char c = x[i++])
{
    printinwords(c);
    printf(" ");
}

really cool solution here, E. I didn't know we could set the while loop up like that.